1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95"; 36 #endif 37 #endif /* not lint */ 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <signal.h> 42 #include <unistd.h> 43 #include <stdlib.h> 44 45 #include "shell.h" 46 #define DEFINE_OPTIONS 47 #include "options.h" 48 #undef DEFINE_OPTIONS 49 #include "nodes.h" /* for other header files */ 50 #include "eval.h" 51 #include "jobs.h" 52 #include "input.h" 53 #include "output.h" 54 #include "trap.h" 55 #include "var.h" 56 #include "memalloc.h" 57 #include "error.h" 58 #include "mystring.h" 59 #include "builtins.h" 60 #ifndef NO_HISTORY 61 #include "myhistedit.h" 62 #endif 63 64 char *arg0; /* value of $0 */ 65 struct shparam shellparam; /* current positional parameters */ 66 char **argptr; /* argument list for builtin commands */ 67 char *shoptarg; /* set by nextopt (like getopt) */ 68 char *nextopt_optptr; /* used by nextopt */ 69 70 char *minusc; /* argument to -c option */ 71 72 73 static void options(int); 74 static void minus_o(char *, int); 75 static void setoption(int, int); 76 static void setoptionbyindex(int, int); 77 static int getopts(char *, char *, char **, char ***, char **); 78 79 80 /* 81 * Process the shell command line arguments. 82 */ 83 84 void 85 procargs(int argc, char **argv) 86 { 87 int i; 88 char *scriptname; 89 90 argptr = argv; 91 if (argc > 0) 92 argptr++; 93 for (i = 0; i < NOPTS; i++) 94 optlist[i].val = 2; 95 privileged = (getuid() != geteuid() || getgid() != getegid()); 96 options(1); 97 if (*argptr == NULL && minusc == NULL) 98 sflag = 1; 99 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) { 100 iflag = 1; 101 if (Eflag == 2) 102 Eflag = 1; 103 } 104 if (mflag == 2) 105 mflag = iflag; 106 for (i = 0; i < NOPTS; i++) 107 if (optlist[i].val == 2) 108 optlist[i].val = 0; 109 arg0 = argv[0]; 110 if (sflag == 0 && minusc == NULL) { 111 scriptname = *argptr++; 112 setinputfile(scriptname, 0); 113 commandname = arg0 = scriptname; 114 } 115 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */ 116 if (argptr && minusc && *argptr) 117 arg0 = *argptr++; 118 119 shellparam.p = argptr; 120 shellparam.reset = 1; 121 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */ 122 while (*argptr) { 123 shellparam.nparam++; 124 argptr++; 125 } 126 optschanged(); 127 } 128 129 130 void 131 optschanged(void) 132 { 133 setinteractive(iflag); 134 #ifndef NO_HISTORY 135 histedit(); 136 #endif 137 setjobctl(mflag); 138 } 139 140 /* 141 * Process shell options. The global variable argptr contains a pointer 142 * to the argument list; we advance it past the options. 143 */ 144 145 static void 146 options(int cmdline) 147 { 148 char *kp, *p; 149 int val; 150 int c; 151 152 if (cmdline) 153 minusc = NULL; 154 while ((p = *argptr) != NULL) { 155 argptr++; 156 if ((c = *p++) == '-') { 157 val = 1; 158 /* A "-" or "--" terminates options */ 159 if (p[0] == '\0') 160 goto end_options1; 161 if (p[0] == '-' && p[1] == '\0') 162 goto end_options2; 163 /** 164 * For the benefit of `#!' lines in shell scripts, 165 * treat a string of '-- *#.*' the same as '--'. 166 * This is needed so that a script starting with: 167 * #!/bin/sh -- # -*- perl -*- 168 * will continue to work after a change is made to 169 * kern/imgact_shell.c to NOT token-ize the options 170 * specified on a '#!' line. A bit of a kludge, 171 * but that trick is recommended in documentation 172 * for some scripting languages, and we might as 173 * well continue to support it. 174 */ 175 if (p[0] == '-') { 176 kp = p + 1; 177 while (*kp == ' ' || *kp == '\t') 178 kp++; 179 if (*kp == '#' || *kp == '\0') 180 goto end_options2; 181 } 182 } else if (c == '+') { 183 val = 0; 184 } else { 185 argptr--; 186 break; 187 } 188 while ((c = *p++) != '\0') { 189 if (c == 'c' && cmdline) { 190 char *q; 191 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */ 192 if (*p == '\0') 193 #endif 194 q = *argptr++; 195 if (q == NULL || minusc != NULL) 196 error("Bad -c option"); 197 minusc = q; 198 #ifdef NOHACK 199 break; 200 #endif 201 } else if (c == 'o') { 202 minus_o(*argptr, val); 203 if (*argptr) 204 argptr++; 205 } else 206 setoption(c, val); 207 } 208 } 209 return; 210 211 /* When processing `set', a single "-" means turn off -x and -v */ 212 end_options1: 213 if (!cmdline) { 214 xflag = vflag = 0; 215 return; 216 } 217 218 /* 219 * When processing `set', a "--" means the remaining arguments 220 * replace the positional parameters in the active shell. If 221 * there are no remaining options, then all the positional 222 * parameters are cleared (equivalent to doing ``shift $#''). 223 */ 224 end_options2: 225 if (!cmdline) { 226 if (*argptr == NULL) 227 setparam(argptr); 228 return; 229 } 230 231 /* 232 * At this point we are processing options given to 'sh' on a command 233 * line. If an end-of-options marker ("-" or "--") is followed by an 234 * arg of "#", then skip over all remaining arguments. Some scripting 235 * languages (e.g.: perl) document that /bin/sh will implement this 236 * behavior, and they recommend that users take advantage of it to 237 * solve certain issues that can come up when writing a perl script. 238 * Yes, this feature is in /bin/sh to help users write perl scripts. 239 */ 240 p = *argptr; 241 if (p != NULL && p[0] == '#' && p[1] == '\0') { 242 while (*argptr != NULL) 243 argptr++; 244 /* We need to keep the final argument */ 245 argptr--; 246 } 247 } 248 249 static void 250 minus_o(char *name, int val) 251 { 252 int i; 253 254 if (name == NULL) { 255 if (val) { 256 /* "Pretty" output. */ 257 out1str("Current option settings\n"); 258 for (i = 0; i < NOPTS; i++) 259 out1fmt("%-16s%s\n", optlist[i].name, 260 optlist[i].val ? "on" : "off"); 261 } else { 262 /* Output suitable for re-input to shell. */ 263 for (i = 0; i < NOPTS; i++) 264 out1fmt("%s %co %s%s", 265 i % 6 == 0 ? "set" : "", 266 optlist[i].val ? '-' : '+', 267 optlist[i].name, 268 i % 6 == 5 || i == NOPTS - 1 ? "\n" : ""); 269 } 270 } else { 271 for (i = 0; i < NOPTS; i++) 272 if (equal(name, optlist[i].name)) { 273 setoptionbyindex(i, val); 274 return; 275 } 276 error("Illegal option -o %s", name); 277 } 278 } 279 280 281 static void 282 setoptionbyindex(int idx, int val) 283 { 284 if (optlist[idx].letter == 'p' && !val && privileged) { 285 if (setgid(getgid()) == -1) 286 error("setgid"); 287 if (setuid(getuid()) == -1) 288 error("setuid"); 289 } 290 optlist[idx].val = val; 291 if (val) { 292 /* #%$ hack for ksh semantics */ 293 if (optlist[idx].letter == 'V') 294 Eflag = 0; 295 else if (optlist[idx].letter == 'E') 296 Vflag = 0; 297 } 298 } 299 300 static void 301 setoption(int flag, int val) 302 { 303 int i; 304 305 for (i = 0; i < NSHORTOPTS; i++) 306 if (optlist[i].letter == flag) { 307 setoptionbyindex(i, val); 308 return; 309 } 310 error("Illegal option -%c", flag); 311 } 312 313 314 /* 315 * Set the shell parameters. 316 */ 317 318 void 319 setparam(char **argv) 320 { 321 char **newparam; 322 char **ap; 323 int nparam; 324 325 for (nparam = 0 ; argv[nparam] ; nparam++); 326 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap); 327 while (*argv) { 328 *ap++ = savestr(*argv++); 329 } 330 *ap = NULL; 331 freeparam(&shellparam); 332 shellparam.malloc = 1; 333 shellparam.nparam = nparam; 334 shellparam.p = newparam; 335 shellparam.optp = NULL; 336 shellparam.reset = 1; 337 shellparam.optnext = NULL; 338 } 339 340 341 /* 342 * Free the list of positional parameters. 343 */ 344 345 void 346 freeparam(struct shparam *param) 347 { 348 char **ap; 349 350 if (param->malloc) { 351 for (ap = param->p ; *ap ; ap++) 352 ckfree(*ap); 353 ckfree(param->p); 354 } 355 if (param->optp) { 356 for (ap = param->optp ; *ap ; ap++) 357 ckfree(*ap); 358 ckfree(param->optp); 359 } 360 } 361 362 363 364 /* 365 * The shift builtin command. 366 */ 367 368 int 369 shiftcmd(int argc, char **argv) 370 { 371 int n; 372 char **ap1, **ap2; 373 374 n = 1; 375 if (argc > 1) 376 n = number(argv[1]); 377 if (n > shellparam.nparam) 378 return 1; 379 INTOFF; 380 shellparam.nparam -= n; 381 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) { 382 if (shellparam.malloc) 383 ckfree(*ap1); 384 } 385 ap2 = shellparam.p; 386 while ((*ap2++ = *ap1++) != NULL); 387 shellparam.reset = 1; 388 INTON; 389 return 0; 390 } 391 392 393 394 /* 395 * The set command builtin. 396 */ 397 398 int 399 setcmd(int argc, char **argv) 400 { 401 if (argc == 1) 402 return showvarscmd(argc, argv); 403 INTOFF; 404 options(0); 405 optschanged(); 406 if (*argptr != NULL) { 407 setparam(argptr); 408 } 409 INTON; 410 return 0; 411 } 412 413 414 void 415 getoptsreset(const char *value) 416 { 417 while (*value == '0') 418 value++; 419 if (strcmp(value, "1") == 0) 420 shellparam.reset = 1; 421 } 422 423 /* 424 * The getopts builtin. Shellparam.optnext points to the next argument 425 * to be processed. Shellparam.optptr points to the next character to 426 * be processed in the current argument. If shellparam.optnext is NULL, 427 * then it's the first time getopts has been called. 428 */ 429 430 int 431 getoptscmd(int argc, char **argv) 432 { 433 char **optbase = NULL, **ap; 434 int i; 435 436 if (argc < 3) 437 error("usage: getopts optstring var [arg]"); 438 439 if (shellparam.reset == 1) { 440 INTOFF; 441 if (shellparam.optp) { 442 for (ap = shellparam.optp ; *ap ; ap++) 443 ckfree(*ap); 444 ckfree(shellparam.optp); 445 shellparam.optp = NULL; 446 } 447 if (argc > 3) { 448 shellparam.optp = ckmalloc((argc - 2) * sizeof *ap); 449 memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap); 450 for (i = 0; i < argc - 3; i++) 451 shellparam.optp[i] = savestr(argv[i + 3]); 452 } 453 INTON; 454 optbase = argc == 3 ? shellparam.p : shellparam.optp; 455 shellparam.optnext = optbase; 456 shellparam.optptr = NULL; 457 shellparam.reset = 0; 458 } else 459 optbase = shellparam.optp ? shellparam.optp : shellparam.p; 460 461 return getopts(argv[1], argv[2], optbase, &shellparam.optnext, 462 &shellparam.optptr); 463 } 464 465 static int 466 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, 467 char **optptr) 468 { 469 char *p, *q; 470 char c = '?'; 471 int done = 0; 472 int ind = 0; 473 int err = 0; 474 char s[10]; 475 const char *newoptarg = NULL; 476 477 if ((p = *optptr) == NULL || *p == '\0') { 478 /* Current word is done, advance */ 479 if (*optnext == NULL) 480 return 1; 481 p = **optnext; 482 if (p == NULL || *p != '-' || *++p == '\0') { 483 atend: 484 ind = *optnext - optfirst + 1; 485 *optnext = NULL; 486 p = NULL; 487 done = 1; 488 goto out; 489 } 490 (*optnext)++; 491 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 492 goto atend; 493 } 494 495 c = *p++; 496 for (q = optstr; *q != c; ) { 497 if (*q == '\0') { 498 if (optstr[0] == ':') { 499 s[0] = c; 500 s[1] = '\0'; 501 newoptarg = s; 502 } 503 else 504 out2fmt_flush("Illegal option -%c\n", c); 505 c = '?'; 506 goto out; 507 } 508 if (*++q == ':') 509 q++; 510 } 511 512 if (*++q == ':') { 513 if (*p == '\0' && (p = **optnext) == NULL) { 514 if (optstr[0] == ':') { 515 s[0] = c; 516 s[1] = '\0'; 517 newoptarg = s; 518 c = ':'; 519 } 520 else { 521 out2fmt_flush("No arg for -%c option\n", c); 522 c = '?'; 523 } 524 goto out; 525 } 526 527 if (p == **optnext) 528 (*optnext)++; 529 newoptarg = p; 530 p = NULL; 531 } 532 533 out: 534 if (*optnext != NULL) 535 ind = *optnext - optfirst + 1; 536 *optptr = p; 537 if (newoptarg != NULL) 538 err |= setvarsafe("OPTARG", newoptarg, 0); 539 else { 540 INTOFF; 541 err |= unsetvar("OPTARG"); 542 INTON; 543 } 544 fmtstr(s, sizeof(s), "%d", ind); 545 err |= setvarsafe("OPTIND", s, VNOFUNC); 546 s[0] = c; 547 s[1] = '\0'; 548 err |= setvarsafe(optvar, s, 0); 549 if (err) { 550 *optnext = NULL; 551 *optptr = NULL; 552 flushall(); 553 exraise(EXERROR); 554 } 555 return done; 556 } 557 558 /* 559 * Standard option processing (a la getopt) for builtin routines. The 560 * only argument that is passed to nextopt is the option string; the 561 * other arguments are unnecessary. It return the character, or '\0' on 562 * end of input. 563 */ 564 565 int 566 nextopt(const char *optstring) 567 { 568 char *p; 569 const char *q; 570 char c; 571 572 if ((p = nextopt_optptr) == NULL || *p == '\0') { 573 p = *argptr; 574 if (p == NULL || *p != '-' || *++p == '\0') 575 return '\0'; 576 argptr++; 577 if (p[0] == '-' && p[1] == '\0') /* check for "--" */ 578 return '\0'; 579 } 580 c = *p++; 581 for (q = optstring ; *q != c ; ) { 582 if (*q == '\0') 583 error("Illegal option -%c", c); 584 if (*++q == ':') 585 q++; 586 } 587 if (*++q == ':') { 588 if (*p == '\0' && (p = *argptr++) == NULL) 589 error("No arg for -%c option", c); 590 shoptarg = p; 591 p = NULL; 592 } 593 nextopt_optptr = p; 594 return c; 595 } 596